textproduct: Quad Cities

KEY MESSAGES

- Quiet and somewhat cooler than normal weather will be seen through the second half of the work week, with the pattern becoming active again this weekend and beyond.

SHORT TERM /THROUGH FRIDAY NIGHT/

Issued at 145 AM CDT Thu Jun 18 2026

Wednesday's potent shortwave is now located over the Great Lakes region, as seen on water vapor imagery, with a cold front now well to our east and southeast. Mostly clear skies can be expected through sunrise, with lows in the low to mid 50s. Past sunrise, high pressure will slide in from the Northern Plains to our south, maintaining northwesterly flow. A mostly cool and cloudy day can be expected, with highs in the low to mid 70s. A few isolated showers may be possible during the afternoon and evening with a small disturbance in the flow. Calmer winds and clearing skies Thursday night into Friday will allow temperatures to drop into the mid to low 50s overnight.

Friday will be quite similar but slightly warmer as we stay under high pressure, with highs in the upper 70s to low 80s. Forcing ahead of an embedded shortwave will bring chances for light showers towards evening, with the greatest chances for measurable accumulations north of Highway 30.

LONG TERM /SATURDAY THROUGH WEDNESDAY/

Issued at 145 AM CDT Thu Jun 18 2026

The weekend will bring our next measurable chance for rain Saturday night through Sunday as a shortwave moves through the region. Late Saturday into early Sunday, a shortwave will translate through the central Plains, accompanied by a surface low off the lee of the Rockies. Low level moisture advection will provide a steady stream of moisture as PWATs of 1-2 inches flood northward. Widespread rainfall is expected throughout Sunday, with NBM probabilities showing a 50-70% chance of 24-hour rainfall exceeding 1 inch by Monday morning. In addition to the potential for heavy rainfall, current guidance suggests that there will be some instability with these showers, which would allow for some thunderstorms. At this time, the track of the low and uncertainty in timing make severe potential unclear, but is something to monitor in the coming days.

Past Sunday, ridging behind the shortwave will keep us in northwest flow as high pressure builds into the mid-Mississippi Valley. This will continue the trend of cool temperatures for mid-June as it lingers in place for a day or two until midweek. By midweek, guidance suggests that another system may be possible, though a wide range of solutions, including some that keep high pressure rooted over us, keep the most likely scenarios unclear at this time.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 620 AM CDT Thu Jun 18 2026

VFR conditions will continue through the next 24+ hours as dry air spreads into the region. Some passing mid and high clouds will move by, but all cigs will be above 4kft (and even that is confined to DBQ). Northwest winds of 10-15 kts will blow today, with some gusts to the 15-20 kt range at times. Tonight, light northwest winds are expected.

DVN WATCHES/WARNINGS/ADVISORIES

IA...None. IL...None. MO...None.